diff --git a/java/com/android/incallui/InCallActivity.java b/java/com/android/incallui/InCallActivity.java
index 91f557b..86799bf 100644
--- a/java/com/android/incallui/InCallActivity.java
+++ b/java/com/android/incallui/InCallActivity.java
@@ -129,9 +129,6 @@
 
   private static Optional<Integer> audioRouteForTesting = Optional.absent();
 
-  private final InternationalCallOnWifiCallback internationalCallOnWifiCallback =
-      new InternationalCallOnWifiCallback();
-
   private SelectPhoneAccountListener selectPhoneAccountListener;
 
   private Animation dialpadSlideInAnimation;
@@ -245,13 +242,6 @@
       }
     }
 
-    InternationalCallOnWifiDialogFragment existingInternationalCallOnWifiDialogFragment =
-        (InternationalCallOnWifiDialogFragment)
-            getSupportFragmentManager().findFragmentByTag(Tags.INTERNATIONAL_CALL_ON_WIFI);
-    if (existingInternationalCallOnWifiDialogFragment != null) {
-      existingInternationalCallOnWifiDialogFragment.setCallback(internationalCallOnWifiCallback);
-    }
-
     inCallOrientationEventListener = new InCallOrientationEventListener(this);
 
     getWindow()
@@ -1201,16 +1191,8 @@
   }
 
   public void showDialogForInternationalCallOnWifi(@NonNull DialerCall call) {
-    if (!InternationalCallOnWifiDialogFragment.shouldShow(this)) {
-      LogUtil.i(
-          "InCallActivity.showDialogForInternationalCallOnWifi",
-          "InternationalCallOnWifiDialogFragment.shouldShow returned false");
-      return;
-    }
-
     InternationalCallOnWifiDialogFragment fragment =
-        InternationalCallOnWifiDialogFragment.newInstance(
-            call.getId(), internationalCallOnWifiCallback);
+        InternationalCallOnWifiDialogFragment.newInstance(call.getId());
     fragment.show(getSupportFragmentManager(), Tags.INTERNATIONAL_CALL_ON_WIFI);
   }
 
@@ -1785,28 +1767,6 @@
     static final String ANSWER_AND_RELEASE_ENABLED = "answer_and_release_enabled";
   }
 
-  private static final class InternationalCallOnWifiCallback
-      implements InternationalCallOnWifiDialogFragment.Callback {
-    private static final String TAG = InternationalCallOnWifiCallback.class.getCanonicalName();
-
-    @Override
-    public void continueCall(@NonNull String callId) {
-      LogUtil.i(TAG, "Continuing call with ID: %s", callId);
-    }
-
-    @Override
-    public void cancelCall(@NonNull String callId) {
-      DialerCall call = CallList.getInstance().getCallById(callId);
-      if (call == null) {
-        LogUtil.i(TAG, "Call destroyed before the dialog is closed");
-        return;
-      }
-
-      LogUtil.i(TAG, "Disconnecting international call on WiFi");
-      call.disconnect();
-    }
-  }
-
   private static final class SelectPhoneAccountListener
       extends SelectPhoneAccountDialogFragment.SelectPhoneAccountListener {
     private static final String TAG = SelectPhoneAccountListener.class.getCanonicalName();
diff --git a/java/com/android/incallui/InCallPresenter.java b/java/com/android/incallui/InCallPresenter.java
index a67dab5..526cc64 100644
--- a/java/com/android/incallui/InCallPresenter.java
+++ b/java/com/android/incallui/InCallPresenter.java
@@ -71,6 +71,8 @@
 import com.android.incallui.legacyblocking.BlockedNumberContentObserver;
 import com.android.incallui.spam.SpamCallListListener;
 import com.android.incallui.speakeasy.SpeakEasyCallManager;
+import com.android.incallui.telecomeventui.InternationalCallOnWifiDialogActivity;
+import com.android.incallui.telecomeventui.InternationalCallOnWifiDialogFragment;
 import com.android.incallui.videosurface.bindings.VideoSurfaceBindings;
 import com.android.incallui.videosurface.protocol.VideoSurfaceTexture;
 import com.android.incallui.videotech.utils.VideoUtils;
@@ -775,8 +777,22 @@
   @Override
   public void onInternationalCallOnWifi(@NonNull DialerCall call) {
     LogUtil.enterBlock("InCallPresenter.onInternationalCallOnWifi");
+
+    if (!InternationalCallOnWifiDialogFragment.shouldShow(context)) {
+      LogUtil.i(
+          "InCallPresenter.onInternationalCallOnWifi",
+          "InternationalCallOnWifiDialogFragment.shouldShow returned false");
+      return;
+    }
+
     if (inCallActivity != null) {
       inCallActivity.showDialogForInternationalCallOnWifi(call);
+    } else {
+      Intent intent = new Intent(context, InternationalCallOnWifiDialogActivity.class);
+      // Prevent showing MainActivity with InternationalCallOnWifiDialogActivity on above
+      intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
+      intent.putExtra(InternationalCallOnWifiDialogActivity.EXTRA_CALL_ID, call.getId());
+      context.startActivity(intent);
     }
   }
 
diff --git a/java/com/android/incallui/telecomeventui/AndroidManifest.xml b/java/com/android/incallui/telecomeventui/AndroidManifest.xml
index 861b936..a2134a3 100644
--- a/java/com/android/incallui/telecomeventui/AndroidManifest.xml
+++ b/java/com/android/incallui/telecomeventui/AndroidManifest.xml
@@ -12,4 +12,15 @@
      See the License for the specific language governing permissions and
      limitations under the License.
 -->
-<manifest package="com.android.incallui.telecomeventui"/>
\ No newline at end of file
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.incallui.telecomeventui">
+  <application>
+    <activity
+        android:excludeFromRecents="true"
+        android:exported="true"
+        android:name="com.android.incallui.telecomeventui.InternationalCallOnWifiDialogActivity"
+        android:noHistory="true"
+        android:theme="@style/Theme.Incall.DialogHolder"/>
+  </application>
+</manifest>
diff --git a/java/com/android/incallui/telecomeventui/InternationalCallOnWifiDialogActivity.java b/java/com/android/incallui/telecomeventui/InternationalCallOnWifiDialogActivity.java
new file mode 100644
index 0000000..192c160
--- /dev/null
+++ b/java/com/android/incallui/telecomeventui/InternationalCallOnWifiDialogActivity.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.incallui.telecomeventui;
+
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v7.app.AppCompatActivity;
+import android.text.TextUtils;
+import com.android.incallui.call.CallList;
+import com.android.incallui.call.DialerCall;
+
+/**
+ * Activity containing dialog that may be shown when users place an outgoing call to an
+ * international number while on Wifi.
+ */
+public class InternationalCallOnWifiDialogActivity extends AppCompatActivity
+    implements CallList.Listener {
+
+  public static final String EXTRA_CALL_ID = "extra_call_id";
+  private static final String TAG_INTERNATIONAL_CALL_ON_WIFI = "tag_international_call_on_wifi";
+
+  private String callId;
+
+  @Override
+  protected void onCreate(@Nullable Bundle bundle) {
+    super.onCreate(bundle);
+
+    callId = getIntent().getStringExtra(EXTRA_CALL_ID);
+    if (TextUtils.isEmpty(callId)) {
+      finish();
+      return;
+    }
+
+    InternationalCallOnWifiDialogFragment fragment =
+        InternationalCallOnWifiDialogFragment.newInstance(callId);
+    fragment.show(getSupportFragmentManager(), TAG_INTERNATIONAL_CALL_ON_WIFI);
+
+    CallList.getInstance().addListener(this);
+  }
+
+  @Override
+  protected void onDestroy() {
+    super.onDestroy();
+    CallList.getInstance().removeListener(this);
+  }
+
+  @Override
+  protected void onPause() {
+    super.onPause();
+    // We don't expect the activity to resume, except for orientation change.
+    if (!isChangingConfigurations()) {
+      finish();
+    }
+  }
+
+  @Override
+  public void onDisconnect(DialerCall call) {
+    if (callId.equals(call.getId())) {
+      finish();
+    }
+  }
+
+  @Override
+  public void onIncomingCall(DialerCall call) {}
+
+  @Override
+  public void onUpgradeToVideo(DialerCall call) {}
+
+  @Override
+  public void onUpgradeToRtt(DialerCall call, int rttRequestId) {}
+
+  @Override
+  public void onSessionModificationStateChange(DialerCall call) {}
+
+  @Override
+  public void onCallListChange(CallList callList) {}
+
+  @Override
+  public void onWiFiToLteHandover(DialerCall call) {}
+
+  @Override
+  public void onHandoverToWifiFailed(DialerCall call) {}
+
+  @Override
+  public void onInternationalCallOnWifi(@NonNull DialerCall call) {}
+}
diff --git a/java/com/android/incallui/telecomeventui/InternationalCallOnWifiDialogFragment.java b/java/com/android/incallui/telecomeventui/InternationalCallOnWifiDialogFragment.java
index 2b602f8..71a8be4 100644
--- a/java/com/android/incallui/telecomeventui/InternationalCallOnWifiDialogFragment.java
+++ b/java/com/android/incallui/telecomeventui/InternationalCallOnWifiDialogFragment.java
@@ -21,16 +21,18 @@
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.os.Bundle;
-import android.preference.PreferenceManager;
 import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
 import android.support.annotation.VisibleForTesting;
 import android.support.v4.app.DialogFragment;
 import android.support.v4.os.UserManagerCompat;
 import android.view.View;
 import android.widget.CheckBox;
 import com.android.dialer.common.Assert;
+import com.android.dialer.common.FragmentUtils;
 import com.android.dialer.common.LogUtil;
+import com.android.dialer.storage.StorageComponent;
+import com.android.incallui.call.CallList;
+import com.android.incallui.call.DialerCall;
 
 /**
  * Dialog that may be shown when users place an outgoing call to an international number while on
@@ -53,7 +55,7 @@
       return false;
     }
 
-    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
+    SharedPreferences preferences = StorageComponent.get(context).unencryptedSharedPrefs();
     boolean shouldShow = preferences.getBoolean(ALWAYS_SHOW_WARNING_PREFERENCE_KEY, true);
 
     LogUtil.i("InternationalCallOnWifiDialogFragment.shouldShow", "result: %b", shouldShow);
@@ -61,27 +63,13 @@
   }
 
   /**
-   * Called in response to user interaction with the {@link InternationalCallOnWifiDialogFragment}.
-   */
-  public interface Callback {
-
-    /** Indicates that the user wishes to proceed with the call represented by the given call id. */
-    void continueCall(@NonNull String callId);
-
-    /** Indicates that the user wishes to cancel the call represented by the given call id. */
-    void cancelCall(@NonNull String callId);
-  }
-
-  /**
    * Returns a new instance of {@link InternationalCallOnWifiDialogFragment} with the given
    * callback.
    *
    * <p>Prefer this method over the default constructor.
    */
-  public static InternationalCallOnWifiDialogFragment newInstance(
-      @NonNull String callId, @NonNull Callback callback) {
+  public static InternationalCallOnWifiDialogFragment newInstance(@NonNull String callId) {
     InternationalCallOnWifiDialogFragment fragment = new InternationalCallOnWifiDialogFragment();
-    fragment.setCallback(callback);
     Bundle args = new Bundle();
     args.putString(ARG_CALL_ID, Assert.isNotNull(callId));
     fragment.setArguments(args);
@@ -93,31 +81,12 @@
    * InternationalCallOnWifiDialogFragment InternationalCallOnWifiDialogFragments}.
    */
   @VisibleForTesting
-  static final String ALWAYS_SHOW_WARNING_PREFERENCE_KEY =
+  public static final String ALWAYS_SHOW_WARNING_PREFERENCE_KEY =
       "ALWAYS_SHOW_INTERNATIONAL_CALL_ON_WIFI_WARNING";
 
   /** Key in the arguments bundle for call id. */
   private static final String ARG_CALL_ID = "call_id";
 
-  /**
-   * Callback which will receive information about user interactions with this dialog.
-   *
-   * <p>This is Nullable in the event that the dialog is destroyed by the framework, but doesn't
-   * have a callback reattached. Ideally, the InCallActivity would implement the callback and we
-   * would use FragmentUtils.getParentUnsafe instead of holding onto the callback here, but that's
-   * not possible with the existing InCallActivity/InCallActivityCommon implementation.
-   */
-  @Nullable private Callback callback;
-
-  /**
-   * Sets the callback for this dialog.
-   *
-   * <p>Used to reset the callback after state changes.
-   */
-  public void setCallback(@NonNull Callback callback) {
-    this.callback = Assert.isNotNull(callback);
-  }
-
   @NonNull
   @Override
   public Dialog onCreateDialog(Bundle bundle) {
@@ -134,7 +103,7 @@
 
     CheckBox alwaysWarn = dialogView.findViewById(R.id.always_warn);
 
-    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
+    SharedPreferences preferences = StorageComponent.get(getActivity()).unencryptedSharedPrefs();
     // The default is set to false in this case to ensure that the first time the dialog opens,
     // the checkbox is unchecked.
     alwaysWarn.setChecked(preferences.getBoolean(ALWAYS_SHOW_WARNING_PREFERENCE_KEY, false));
@@ -163,7 +132,7 @@
     preferences.edit().putBoolean(ALWAYS_SHOW_WARNING_PREFERENCE_KEY, alwaysWarn).apply();
 
     // Neither callback nor callId are null in normal circumstances. See comments on callback
-    callback.continueCall(getArguments().getString(ARG_CALL_ID));
+    continueCall(getArguments().getString(ARG_CALL_ID));
   }
 
   private void onNegativeButtonClick(@NonNull SharedPreferences preferences, boolean alwaysWarn) {
@@ -174,6 +143,37 @@
     preferences.edit().putBoolean(ALWAYS_SHOW_WARNING_PREFERENCE_KEY, alwaysWarn).apply();
 
     // Neither callback nor callId are null in normal circumstances. See comments on callback
-    callback.cancelCall(getArguments().getString(ARG_CALL_ID));
+    cancelCall(getArguments().getString(ARG_CALL_ID));
+  }
+
+  private void continueCall(@NonNull String callId) {
+    LogUtil.i(
+        "InternationalCallOnWifiDialogFragment.continueCall",
+        "Continuing call with ID: %s",
+        callId);
+    InternationalCallOnWifiDialogActivity activity =
+        FragmentUtils.getParent(this, InternationalCallOnWifiDialogActivity.class);
+    if (activity != null) {
+      activity.finish();
+    }
+  }
+
+  private void cancelCall(@NonNull String callId) {
+    DialerCall call = CallList.getInstance().getCallById(callId);
+    if (call == null) {
+      LogUtil.i(
+          "InternationalCallOnWifiDialogFragment.cancelCall",
+          "Call destroyed before the dialog is closed");
+    } else {
+      LogUtil.i(
+          "InternationalCallOnWifiDialogFragment.cancelCall",
+          "Disconnecting international call on WiFi");
+      call.disconnect();
+    }
+    InternationalCallOnWifiDialogActivity activity =
+        FragmentUtils.getParent(this, InternationalCallOnWifiDialogActivity.class);
+    if (activity != null) {
+      activity.finish();
+    }
   }
 }